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When to use service locator dependency injection

When will you use dependency injection? Is there a huge advantage to using dependency injection?

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Fowler has a good comparison between the two in his handling of the control containers and the Injection Dependency Heading . In his final thoughts, he says:

Dependency injection is a useful alternative to Service Locator. when application classes for applications two are approximately equivalent, but I think that the service locator has a slight advantage due to its more direct behavior. However, if you are creating classes for being used in several applications, then dependency injection is a better choice.

You can find more viewpoints and comparisons in here.

For DI:

  • It's easier to determine what dependencies a component has - look at the constructor.
  • The component is not dependent on the Service Locator, so there is no problem if the component is used with another framework.
  • DI can simplify testing, but a good service locator mechanism will do equivalent performance

Against DI:

  • It’s more difficult to debug and understand.
  • .
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